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Finding the Fourth Proportional to 399.33, 599.91 and 322.79

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Solution

The fourth proportional to 399.33, 599.91 and 322.79 is: 484.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.33 : 599.91 = 322.79 : x
  2. Step 2: Convert to fraction form
    399.33/599.91 = 322.79/x
  3. Step 3: Cross multiply
    399.33x = 599.91 × 322.79
  4. Step 4: Simplify right side
    399.33x = 193,640.74
  5. Step 5: Solve for x
    x = 193,640.74/399.33
  6. Step 6: Final answer
    x = 484.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.